Loewenheim



E. LOEWENHEIM HINGED TYPE FLUE DAMVPER WITH AUXILIARY CLOSURE Filed June12, 1945 3 Sheets-Sheet 2 Nov. 29, 1949 E. LOEWENHEIM HINGED TYPE FLUEDAMPER WITH AUXILIARY CLOSURE 3 Sheets-Sheet C5 Filed June 12, 1945 l"L0 @merz/he mf WMVA/Q Patented Nov. 29, 1949 orf-ICE HINGED TYPE liLUE'DAMPER WITH AUX-ILIARY CLOSR Ernst Loewenheim, London, EnglandApplication June1`2, 1945, Seral No.l 599,091 In yGreatBritain June 2,1944 1 Claim. (C1. 126-2815) This invention relates to dampersfof theswivel ling type. t

Dampers of this, type are much affected in `their operation vas theresult of the deposit of flue dust in their vicinity and particularly-at thekbottom of the flues and on stops, guides Vand the like providedtherein and in association with such dampers.

lThus, ue dust may accumulate against the lower edge of the hingeddamper when the, damper is enclosed and in consequence opposer orprevent altogether its opening. t

In other casesdeposits of iiue dust may accumulate when the damper isopen and provide resistance to its closing. i

Such difficulties do not usually arise in connection with darnpers ofthe sliding type, not only because of their vertical instead of circularmovement, but also for the reason that when thel aperture between thelower edge of the slide and the flue bottom is very small the velocityof the flue gases passing through the aperture which is in the form of aslit increases greatly thereby sweeping away any flue dust which mayhave accumulated. With hinged dampers just before 'they have reached theclosed position or shortly after opening, the gases are free to passaround all edges o'f the damper, or if the damper is of the louvredformation, around all edges of the damper ele-` ments. The result isthat in a nearly closed louvre damper the velocity of the gases at thebottomof the ue is hardly greater than at other parts of the damper andthe ue dust deposits are not automatically removed.

In dampers of this kind, when there is an accumulation oi flue dust, thedamper has to remain partly opened untilV the ue `dust has been removedby other means, and if it shouldv be attempted to close the damper byforce the dust ismerely consolidated. If in the case of a louvred ndamper al1 of the pivoted damper elements are operated by the sameoperating gear, as is usually the case, none of the elements can bebrought into the fully closed position if any one ofthein; is preventedfrom closing.

These difficulties are common with hinged dampers and have increasedduring recent years` the same advantages as are possessed bysiidn'g55j?A and rollerviblind dempers of the rigid or flexible type.

in association with the damperata-.position ada'e cent to where theaccumulation of ue dust would be likely to interfere withl the 'closureofthe nue' bythe hinged ydamper elements of an auxiliary elementadaptedto be moved independently of.

opened and closed while the' damper' is in"` it'sclosed position.

The result of moving the-auxiliary element' into its open position whiletnedaiper is closed is; that the flue gases can 'only iiow through. theopening, thereby greatiylincreasing their velocity.. In yconsequeneethis part is swept clear of any `-fiiii'e Where of the rigid type iti'riay'` also comprise resilient elements or iilexibllments to assist ineieeting a seal'.

The auxiliary element may be applied at the bottom' of' the; flue oi'any other position, lfor instance at the sides of horizontal or verticaliiue's`Y inl order to keep the stops or` abutments for the dampenelement freel fr'oii" accumulations of flue dust'.

Y The auxiliary element may' be operated by anV operating gearsopera-ted from outside independently from the damper operating' gear.ItV may alternatively be' coupled with the latter in such a? way thatthe auxiliaiyeleinentf' is moved into" the open position just before-anddurin'gthe closing and before and during thel opening of' the damper; Ht t I Where the auxiliary eiement isI of the hinged' typey it may be"secured to a shaft pivotail'y mounted and having secured to it anoperating' lever, the element' beingjpr'ovided optionally with aresilient pad which wiilir'est 'against'tne bottom frame when thedamperis'- cis'ed.

where tneauxiiiary eiemfent is' of the siiding" type; itmay-beanfangedin guides' on the frame with whichthedar'npe is associatedand 'secured- The invention consists, broadly, lin the. provision tomeans whereby it may be raised and lowered.

Where the auxiliary element is of the flexible type, it may be securedat its lower extremity to a roller, the upper extremity of the elementbeing xed.

The roller is provided at one or both ends with an extension to whichone end of a tape or like flexible element is secured, the other endbeing connected with a segment connected to a shaft adapted to berotated by a central gear, the connection of the tape or band and theflexible auxiliary element to the roller being such that by the rotationof the segment the tape or band is unwound from the roller which is inconsequence K caused to rotate thereby causing the flexible element tobe wound about it.

This construction will enable the flexible mag terial to be moved with aminimum of friction between it and the framework of the damper.

The invention will be :described further in detail and by way of examplewith reference to the accompanying drawings in which:

Figure 1 is a view of a damper and its associated frame positioned in aflue;

Figure 2 is a sectional plan view of the construction in question on amajor scale;

Figures 3 and 4 are views in elevation illustrating more clearly themode of construction and operation of the auxiliary element shown inFigures 1 and 2;

v Figure 5 is a view in section of a construction of louvered damper;

Figure 6 is a fragmentary view on an enlarged scale also in section ofthis construction;

Figure '1 is a view in elevation thereof;

Figure 8 is a fragmentary view in section of a construction of a damperwith the auxiliary element in the closed position;

Figure 9 is a corresponding view with the auxiliary element in the openposition;

Figure 10 is a fragmentary view in elevation;

Figure 11 is a View in plan, and

Figure 12 is a View in section of a further construction of a damper inaccordance with the invention.

Referring to Figures 1-4, I is the damper blade secured by arms 2 one ofwhich is shown inv Figure 2 and to a shaft 3 arranged in a bearing 4 andits upper end in a bearing 5 for rotation by means of the lever 6secured to it.

The bearing 5 is provided in a cover plate 1 furnished with a liftingeye 8 in forming part of the frame 9 of the damper.

To this frame there are secured flaps of flexible material Ei)associated with guards lIl to which their outer edges are secured atintervals byV tapes I2 designed to limit the degree of motion which maybe imparted to the flaps under the action of the draught.

This frame is shown in Figure 2 associated with flexible flaps I3 bywhich a gastight joint is made between it and the channel element I4secured in the walls I5 of the flue. v

In brackets I6 extending from the lower end of the frame there ismounted a spindle I1 secured to the auxiliary member I8 which is in theform of a flap and is furnished with a counterweight I9 adapted toconstrain it into the position shown in Figure 4.

On each of the frame members there are provided abutments against whichthis flap will bear when in the closed position and to the spindle thereis connected an arm 2| furnished with a roller 22 adapted to co-operatewith a rampl 23 so as to cause the auxiliary member I 8 tomove from theposition shown in Figure 4 to the position shown in Figure 3 when thehinged damper is closed.

` In opening the damper as will be appreciated the roller 22 descendingthe damper will permit the auxiliary member to move into the positionshown in Figure 4 under the action of the counterweight I9.

Figure 5 illustrates a damper comprising two members 24 pivoted aboutthe axis of the rods 25.

These members are associated with a frame, the upper element 26 and thelower element 21 of which can be seen from the drawings and with theupper member of the frame there is provided a flap 28 of flexiblematerial, a ap 29 of similar material being secured to the lower of thetwo damper elements.

On the lower element 21 of the frame there is also provided a ap 3Dadapted to co-operate with the lower of the two damper members 24 and toits lower frame member there is connected an auxiliary member 3|furnished with a pad 32 and pivoted on a spindle 33 to which isconnected a lever 34 in turn connected with a link 35 oscillated by anysuitable means so that motion imparted to the lever in the initialopening of the damper will raise the auxiliary member into the positionshown in full lines in Figure 6 thereby allowing gases to pass throughthe lower frame member through the space 36 provided between it and thebase 31 of the flue.

In t'he case of the construction shown in Figures 8 and 9, the auxiliarymember indicated by the reference 38 is arranged so that it may beraised vertically under the action of a rod 39 oscillated by anysuitable means.

This member is likewise connected with the frame of the flue and thedamper itself is arranged to pivot in a manner similar to the lowerdamper element in the case of the construction shown in Figures 5-7.

Referring to Figures l0-l2, 4i] is a channel member arranged in the wallof the flue providing an air duct in which the mechanism for operatingthe damper element and the auxiliary means is located.

AThe damper element 4I is secured to a shaft 42 supported in bearings,one of which 43 is shown and provided with a gear wheel or the like 44by which it may be rotated.

On the side member 45 of the damper frame there is secured a member 46of flexible material,

the member 45 being provided with extensions 41 which are connected ateach end with a band 5I with a segment 52 mounted upon a shaft 53 towhich is secured a lever 54, the outer end of which is secured to a rod55 oscillated by any suitable` means.

By moving this lever about the axis of the shaft 53 the segment may berotated and such rotational motion will impart rotational motion to theshaft 53, thereby operating to raise and lower the bottom portion of theflexible element 4S or in other words roll the lower portion of thiselement on or unroll it from the roller in question, thereby in the onecase providing an opening 56 through which flue gases may pass.

Adjacent to the lower end of the damper frame there are provided guards51 which also provide a rest for the roller 49 when it is in its loweredv position.

I claim:

In a damper construction located in a conduit, the combination of ahinged main damper element; means operable externally of the conduit formoving said element from a fully open position into a substantiallyfully closed position in which a restricted opening is left between thelower edge of said element and the base of the conduct; and an auxiliarydamper element mounted on said main element and operating means formoving the auxiliary damper element into a position to close saidrestricted opening, when the main element has been moved into its saidsubstantially closed position, and for moving the auxiliary damper `fromthe position in which it closes the restricted opening, before the mainelement is moved in the reverse direction.

ERNST LOEWENHEIIVI.

6 REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTs Great Britain May 12, 1948

